From 623f5a76800cc2e2dd784b8b0bbac0cf50fed767 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Fri, 24 Dec 2010 19:09:38 +0000
Subject: [PATCH] ThreadNumber: fixed error.

---
 libs/libcommon/src/ThreadNumber.cpp | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/libs/libcommon/src/ThreadNumber.cpp b/libs/libcommon/src/ThreadNumber.cpp
index 05cd4211921..7c535244497 100644
--- a/libs/libcommon/src/ThreadNumber.cpp
+++ b/libs/libcommon/src/ThreadNumber.cpp
@@ -1,3 +1,6 @@
+#include <pthread.h>
+#include <Yandex/optimization.h>
+
 #include <Yandex/ThreadNumber.h>
 
 
@@ -6,7 +9,13 @@ unsigned threads = 0;
 
 unsigned ThreadNumber::get()
 {
+	static pthread_mutex_t mutex = PTHREAD_MUTEX_INITIALIZER;
 	if (unlikely(!thread_number))
-		thread_number = __sync_add_and_fetch(&threads, 1);
+	{
+		pthread_mutex_lock(&mutex);
+		if (likely(!thread_number))
+			thread_number = ++threads;
+		pthread_mutex_unlock(&mutex);
+	}
 	return thread_number;
 }